boynton



(No Model.) 2 Sheets-Sheet 1.

N. A. BOYNTON.

DAMPER FOR FURNACE 0R STOVE PIPES. No. 279,530. Patented June 19,1883.

(No Mbdel.) 2 SheetsSheet 2.

N. A. BOYNTON.

DAMPER FOR FURNACE 0R STOVE PIPES.

NO. 279,530. Patented June 19,1883.

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' UNITED STATES PATENT QFFICEO NATHANIEL A. BOYNTON, F NEWYORK, n. Y, ASSIGNOR ro CHARLES B.

BOYNTON, or SAME PLACE;

DAMPER FoR FURNACE 0 STOVE PIPES.

SPECIFICATION formingpart of Letters Patent No. 279,530, dated June 19, 1883,

Q Application filerlMarchQT, 1853. (Nommlela To all whom it may concern: Be it known that I, NATHANIEL A. Born- TON, of New York, in the county of New York and State of New York, have invented certain Improvements in Dampers for Stove or Furnace Pipes, of which the following is a specification.

This invention relates to dampers or checkvalves for use in connection with the smokepipes of furnaces or stoves; and the invention consists in the novel construction of the parts, whereby it can be cheaply made and applied,

and be readily operated from a distance, and

tion. Figs. 4 and 5 illustrate the application of the damper.

The object of this invention is to produce a simple and efficient form of damper or checkvalve that can be readily applied to the smokepipes of furnaces or stoves, in whatever position they may happen to be, for the purpose of checking the draft, and so constructing it that the parts can be cast complete and be assembled or put together without any boring, drilling, or machining of the parts, and so it can be readily operated from another room from that in which the furnace or its pipe is located, thus saving time and labor on the part of the attendant.

As a general. rule,the draft of furnaces is regulated either at the front by means of draft doors or slides, or by dampers placed within the smoke-pipe. I11 order to operatethese it is usually necessary to go to the furnace, and they are therefore very apt to be neglected, thereby creating too great alternations of temperature, while the placing. of dampers. in the smokepipes is very objectionable, for the reason that if too nearly closed they shut the pipe to such an extent as to prevent the passage of the gases produced by combustion, which are thereby forced out into the building, and which, as is Well known, are very detrimental to health.

between the furnace and the chimne said valve at the same time serving to partially close the pipe, as hereinafter explained. To accomplish this result I make a cast-iron frame, A, of the form shown in Figs. 1 and 2. It is curved laterally to correspond to the size of the pipe to which it is to be secured, and is provided with a rectangular opening, B, around the edges of which is formed a flange, I), which projects far enough to present a flat face, this flange being provided along the top and its two sides with an inwardly-pi'ojeeting lip, y, for the valve to rest against when closed, as shown in Figs. 1, 2, and 3. In the flanges I), at their lower ends, on each side, I form a semi circular recess, (1, as shown in Fig. 1, to re ceive thej ournals f of thevalve V. At the center of the lower end of this frame A, 1 form a rectangular recess, (2, as shown in Fig. 3, to recei "e and hold a corresponding]y-shaped nut,

o. A series of hol es, mare also made in the frame 7 5 A, as shown in Figs. 1 and 2, to receive the rivets by which the frame A is to be secured to the pipe, the frame being so shaped that it can be cast complete with the recesses a and the holes 11, thus avoiding the necessity of any drilling or boring.

The valve V, I make in the form of a thin rectangular plate, as shown detached in Fig. 1, it being provided with a circular journahf, at

its lower end, on each side, these journals being connected by a semicircular rib, p, which extends all the way across the lower end of the plate, so as to fit snugly to its bearing at the lower side of the opening in the frame, and

thus make a close-fitting joint at that point,

whether the valvebe opened or closed. From one of the journals an arm or lever, I, projects in the plane of the valve, but in the opposite direction, as shown in Fig. 1, saidarm being provided at its extremity with a small lateral 9 5 projection or wrist, Z, for attaching a weight,

I then provide a small plate, 0,

\V, as shown. of such a length as to extend across the frame from sidelto side, its inner face being made concave to fit snugly againstthe bead 1) on the in place by the bolt 1 and nut e.

lower end of the valve V, and having on each end a projection provided with a semicircular recess, a, to fit over the journals f, as represented in Figs. 1 and 2, the latter showing the parts in position. At its center this plate 0 has a projection or boss,d, which comes opposite the recess 0 in the lower part of the frame A, and has a hole at its center through which a bolt, t, is inserted to clamp and hold the plate (1 fast to the frame A, shown in Figs. 2 and 3. The parts being thus constructed, the valve V is placed within the frame A, with its j ournals resting in the recesses (1, its body all around the edges fitting snugly against the inner face of the lip g,when the clamp or plate 0 is secured In this condition it is ready for use. Ordinarily the frame A will first be riveted to the pipe, in which a rectangular hole has been cut of such a size as to permit the valve to swing inward through it, care being taken to place the nut 0 in the recess 6 before the frame is secured to the pipe, the nut thus being held securely in place and prevented from dropping out or turning when the bolt t is screwed into it from the outside, as shown clearly in Fig. 3, in which P indicates a section of the pipe, the valve and clamp (I being applied after the frame has been riveted to the pipe. It is obvious that, if preferred, a square-headed bolt may be used, and the bolt be inserted from the inner side of the frame, with its head resting in the recess, and then have the nut applied on the outside, the result being the same; but the plan shown is preferred, as it makes a neater finish.

It should be. observed that the valve .V is

made reversible by having its two faces preeisely alike, with its journalsfand the bead p projecting equally from the center laterally on each side or face. By this means it can'be reversed in the frame A by simply removing the clamp 0, taking the valve out, turning it over, and replacing it and the clamp C. This is an important feature, as it often happens that the smoke-pipe .runs close alongside of a wall, where there is not room for the arm I and weight V, and in-which case by reversing it, as above stated, the arm and its weight will be brought on the other side of the pipe This damper may be applied with equal facility to a pipe running either horizontally, as shown in Fi 4, or to a vertical pipe, as shown in Fig. In either case by attaching a cord or chain, L, to the wire lawhich is bentaround the wrist Z and has the weight \V attached, as shown in Figs. 2 and 4, the cord L can be carried to any point desired, as indicated in Fi 4, and be secured in any desired manner, thus enabling the occupants of .the room above to regulate the draft, and consequently the temperature, at will without going 'near the fur-- nace. The damper may be applied to a hori zontal pipe, either on its upper or lower side,

preferred, the only difference being that if applied to the upper side,.as injFig. 4, the

weight will tend to hold it closed, while if placed on the lower side the weight will tend to hold it open. If applied below, the inward draft of air will. prevent any sparks or ashes from passing out at that point.

\Vhile this damper is specially designed for furnaces, it is equally adapted for use in connection with ranges and stoves, and as such usually have their pipes arranged in a vertical position, and as the valve will be located in the room, the weight and cord in such cases may be dispensed with, the intention being to make the weight of the arm I just equal to that of the valve V, whereby it will serve as a counter-balance and hold the valvein any position to which it may be adjusted. By tightening the clamp C by the bolt t the friction 011 the journals f may be adjusted so as to hold the valve against any accidentalmovement by the draft or otherwise. As the valve is opened it swings inward, thereby partially closing the pipe, and is inclined so as to deflect the current of air in the direction of the passing cur rent of smoke and gases.

The device as constructed is exceedingly simple and cheap in its construction, and is very efficient. j By its use the draft, and consequently the heat, canv be regulated with the greatest accuracy, thus insuring much greater uniformity of temperature, and that, too,without leaving the room, and without any liability of causing the gases of combustion to escape from the furnace or stove into the building.

I am aware that check-valves have before been applied to stove-pipes, and that weights havev been so applied as to hold the valve closed, or hold it entirely open, but not so as to hold ,it at any intermediate point desired. I am also aware that a cord or chain has been connected to a damper or valve and extended into the rooms above, so it could be regulated therefrom, and hence I do not claim these features as of my invention; but

Vhat I do claim is 1. The valve V, having its two sides in duplicate and provided with an arm or le ver, I, secured to one of its projecting journals, whereby said valve may be reversed in its bearings, so as to throw the arm I on one or made the other side of the pipe, substantially as described.

2. 'The pivoted plate-valve V, having a portion, I, extended to the opposite side of its pivot or bearing, said extended portion being so proportioned to the weight of the plate V as to balance the same without the use of any other weight than that of the extended portion itself.

3. The frame A, having its body curved to fit upon the exterior of a stove-pipe, andhaving the recesses a, to receive the journalsf of the valve, and the raised portion 1), with the inwardly-projecting flange g for the valve to shut against, in combination with the swingi-ng valve V and the elanipingplate C, all eonswinging; valve Y, the clamping-plate G and 10 struoted and arranged to operate substantially bolt t, arranged to operated as deseribedmhereas described. by the friction on the journals of the Valve 4. The frame A, provided with a recess, 6, may be varied at will, as set forth.

' to receive the nut or bolt head and prevent the A BOYNTON;

same from turning therein, in combination With the clamping-plate G and bolt t, substan* \Vitn'esses:

tially as set forth. r JOSEPH \VO ELL, 5. In oolnbinatioimvith the frame A and the H. J.- SCHNEIDER. 

